Regression Analysis - Y = XB + e , Matrix Form [br][br]1) Vectors R(1) R(x) ( Green ) in plane with variables x(j) , B(j) [br][br]2) Blue Triangle with Indices Y(i) Hat ; Y (i) ; Y Bar[br][br]3) Green Circle Transformed Indices too " Plan " view. [br][br]4) Blown up view of the Green Circle[br][br]5) Dimensioned Detail of Green Circle ( Blue, Purple, Red ) Dimensions[br][br]I have pointed out as simple as possible the Relationship between Y hat , Y i , Y bar , & e i